thunderstorm80
1 kW
- Joined
- Mar 29, 2016
- Messages
- 383
Hi,
No matter what tight sealing you have, water/humidity will always find it's way into a motor due to pressure breathing.
I've had two ideas how you can negate the water issue.
1. What if, after every rainy ride, you would induce the motor's windings to a series of heating&cooling phases by providing a DC current into them?
More specifically, selecting one winding, and driving a DC phase current which is more or less with the proper magnitude to the resistance. Such DC current will only try to move the motor briefly until it's locked into position, so there won't be any torque you would need to resist while doing it.
When you reach 110-120degrees according to the CA, you would stop and let the motor cool back to ambient. Afterward, you can apply the same DC current again.
Since water evaporates at 100 degrees at sea level pressure, and assuming the motor can't be 100% sealed, then the motor's cavity also have that pressure, perhaps just a bit more. Boiling water need a lot of volume to take over, and so it will find it's way out via pressure breathing. Once the motor cools back it will draw again ambient air, but that would have much less water vapor contact then what you were letting out by boiling. Since not all the water will get cleared by boiling in the first phase, doing it over for a second and perhaps a third time can help.
I tend to believe, that if there was actually a pool of water inside, then there would be visible traces of condensing water vapors on the first heating phase, as it exits the motor's cavity.
2. Drilling a small hole in the motor's cover, as close as you can to the air-gap between the stator and the rotor and plugging it back with a rubber plug. After being exposed to rain, once the conditions are dried outside, you take off the plug and do your ride without it. The heating/cooling oscillations will quickly help to get rid of any ingested water, but dust/airborne road debris will be eventually collected in over the time...
3. Combining the two: Unplugging the rubber plug from #2 only when doing #1, in the safety of your home/garage, therefor eliminating any danger from dust/debris going in.
What do you think?
I tend to believe #1 is enough, since drilling a hole poses other risks for motor.
No matter what tight sealing you have, water/humidity will always find it's way into a motor due to pressure breathing.
I've had two ideas how you can negate the water issue.
1. What if, after every rainy ride, you would induce the motor's windings to a series of heating&cooling phases by providing a DC current into them?
More specifically, selecting one winding, and driving a DC phase current which is more or less with the proper magnitude to the resistance. Such DC current will only try to move the motor briefly until it's locked into position, so there won't be any torque you would need to resist while doing it.
When you reach 110-120degrees according to the CA, you would stop and let the motor cool back to ambient. Afterward, you can apply the same DC current again.
Since water evaporates at 100 degrees at sea level pressure, and assuming the motor can't be 100% sealed, then the motor's cavity also have that pressure, perhaps just a bit more. Boiling water need a lot of volume to take over, and so it will find it's way out via pressure breathing. Once the motor cools back it will draw again ambient air, but that would have much less water vapor contact then what you were letting out by boiling. Since not all the water will get cleared by boiling in the first phase, doing it over for a second and perhaps a third time can help.
I tend to believe, that if there was actually a pool of water inside, then there would be visible traces of condensing water vapors on the first heating phase, as it exits the motor's cavity.
2. Drilling a small hole in the motor's cover, as close as you can to the air-gap between the stator and the rotor and plugging it back with a rubber plug. After being exposed to rain, once the conditions are dried outside, you take off the plug and do your ride without it. The heating/cooling oscillations will quickly help to get rid of any ingested water, but dust/airborne road debris will be eventually collected in over the time...
3. Combining the two: Unplugging the rubber plug from #2 only when doing #1, in the safety of your home/garage, therefor eliminating any danger from dust/debris going in.
What do you think?
I tend to believe #1 is enough, since drilling a hole poses other risks for motor.